The lifting of the spin degeneracy of energy bands in low-dimensional systems is a consequence of the relativistic spin orbit interaction (SOI) and the inversion asymmetry at the surface. The unveiling of the spin character in two-dimensional (2D) spintronic systems is of crucial importance for the manipulation of spin textures without the presence of applied voltages. Fully determining the spin-dependent properties is of major importance on Rashba-type materials [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, topological insulators[7]}, [8]}, [9]}, [10]}, spinterfaces [11]}, [12]}, [13]}, among others. A deep understanding of these systems often requires using a spin-polarized electron beam to be used as a probe. Spin-polarized electron sources are essential, for instance, for spin-polarized low-energy electron microscopy (SPLEEM) or spin-polarized inverse photoemission spectroscopy (SPIPES), which is the most direct technique to determine unoccupied electronic states with \(k\) -resolution [14]}, [15]}, [16]}, [17]}, [18]}, [19]} and spin-resolution [20]}, [21]}, [22]}.
